//
//  NSDate+Helper.m
//  iSeal5200
//
//  Created by He Yuan on 12-12-14.
//  Copyright (c) 2012年 http://www.heyuan110.com. All rights reserved.
//

#import "NSDate+Extend.h"

@implementation NSDate(Extend)

//获取年月日如:19871127.
- (NSString *)getFormatYearMonthDay
{
    
    NSString *string = [NSString stringWithFormat:@"%d%02d%02d",[self getYear],[self getMonth],[self getDay]];
    
    return string;
}

//返回当前月一共有几周(可能为4,5,6)
- (int )getWeekNumOfMonth

{
    
    return [[self endOfMonth] getWeekOfYear] - [[self beginningOfMonth] getWeekOfYear] + 1;
    
}

//该日期是该年的第几周
- (int )getWeekOfYear
{
    int i;
    
    int year = [self getYear];
    
    NSDate *date = [self endOfWeek];
    
    for (i = 1;[[date dateAfterDay:-7 * i] getYear] == year;i++)
        
    {
        
    }
    
    return i;
}

//返回day天后的日期(若day为负数,则为|day|天前的日期)
- (NSDate *)dateAfterDay:(int)day
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    // Get the weekday component of the current date
    
    // NSDateComponents *weekdayComponents = [calendar components:NSWeekdayCalendarUnit fromDate:self];
    
    NSDateComponents *componentsToAdd = [[NSDateComponents alloc] init];
    
    // to get the end of week for a particular date, add (7 - weekday) days
    
    [componentsToAdd setDay:day];
    
    NSDate *dateAfterDay = [calendar dateByAddingComponents:componentsToAdd toDate:self options:0];
            
    return dateAfterDay;
    
}

//month个月后的日期
- (NSDate *)dateafterMonth:(int)month
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *componentsToAdd = [[NSDateComponents alloc] init];
    
    [componentsToAdd setMonth:month];
    
    NSDate *dateAfterMonth = [calendar dateByAddingComponents:componentsToAdd toDate:self options:0];
        
    return dateAfterMonth;
}

//获取日
- (NSUInteger)getDay
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *dayComponents = [calendar components:(NSDayCalendarUnit) fromDate:self];
    
    return [dayComponents day];
}

//获取月
- (NSUInteger)getMonth
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *dayComponents = [calendar components:(NSMonthCalendarUnit) fromDate:self];
    
    return [dayComponents month];
}

//获取年
- (NSUInteger)getYear

{
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *dayComponents = [calendar components:(NSYearCalendarUnit) fromDate:self];
    
    return [dayComponents year];
}

//获取小时
- (int )getHour
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSUInteger unitFlags =NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit |NSHourCalendarUnit |NSMinuteCalendarUnit;
    
    NSDateComponents *components = [calendar components:unitFlags fromDate:self];
    
    NSInteger hour = [components hour];
    
    return (int)hour;
}

//获取分钟
- (int)getMinute
{
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSUInteger unitFlags =NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit |NSHourCalendarUnit |NSMinuteCalendarUnit;
    
    NSDateComponents *components = [calendar components:unitFlags fromDate:self];
    
    NSInteger minute = [components minute];
    
    return (int)minute;
}

//获取小时
- (int )getHour:(NSDate *)date {
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSUInteger unitFlags =NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit |NSHourCalendarUnit |NSMinuteCalendarUnit;
    
    NSDateComponents *components = [calendar components:unitFlags fromDate:date];
    
    NSInteger hour = [components hour];
    
    return (int)hour;
    
}

//获取分钟
- (int)getMinute:(NSDate *)date
{
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSUInteger unitFlags =NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit |NSHourCalendarUnit |NSMinuteCalendarUnit;
    
    NSDateComponents *components = [calendar components:unitFlags fromDate:date];
    
    NSInteger minute = [components minute];
    
    return (int)minute;
}

//获取秒
- (int)getSecond:(NSDate *)date
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSUInteger unitFlags =NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit |NSHourCalendarUnit |NSMinuteCalendarUnit;
    
    NSDateComponents *components = [calendar components:unitFlags fromDate:date];
    
    NSInteger s = [components second];
    
    return (int)s;
}

//获取秒
- (int)getSecond
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSUInteger unitFlags =NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit |NSHourCalendarUnit |NSMinuteCalendarUnit;
    
    NSDateComponents *components = [calendar components:unitFlags fromDate:self];
    
    NSInteger s = [components second];
    
    return (int)s;
}


//在当前日期前几天
- (NSUInteger)daysAgo
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *components = [calendar components:(NSDayCalendarUnit)
                                    
                                               fromDate:self
                                    
                                                 toDate:[NSDate date]
                                    
                                                options:0];
    
    return [components day];
}

//午夜时间距今几天
- (NSUInteger)daysAgoAgainstMidnight
{
    // get a midnight version of ourself:
    
    NSDateFormatter *mdf = [[NSDateFormatter alloc] init];
    
    [mdf setDateFormat:@"yyyy-MM-dd"];
    
    NSDate *midnight = [mdf dateFromString:[mdf stringFromDate:self]];
    
    return (int)[midnight timeIntervalSinceNow] / (60*60*24) *-1;
}


//几天前，比如今天，昨天，2天前
- (NSString *)stringDaysAgo
{
    return [self stringDaysAgoAgainstMidnight:YES];
}


- (NSString *)stringDaysAgoAgainstMidnight:(BOOL)flag
{
    
    NSUInteger daysAgo = (flag) ? [self daysAgoAgainstMidnight] : [self daysAgo];
    
    NSString *text = nil;
    
    switch (daysAgo) {
            
        case 0:
            
            text = @"今天";
            
            break;
            
        case 1:
            
            text = @"昨天";
            
            break;
            
        default:
            
            text = [NSString stringWithFormat:@"%d 天前", daysAgo];
            
    }
    
    return text;
}

//计算已经距离当前的时间，取最大值
+ (NSString *)stringFromDateNow:(NSDate*)todate
{
    NSCalendar *cal = [NSCalendar currentCalendar];//定义一个NSCalendar对象
    NSDate *today = [NSDate date];//得到当前时间
    unsigned int unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    NSDateComponents *d = [cal components:unitFlags fromDate:todate toDate:today options:0];
    NSInteger year = [d year];
    NSInteger month = [d month];
    NSInteger day = [d day];
    NSInteger hour = [d hour];
    NSInteger minute = [d minute];
    NSInteger second = [d second];
    if (year > 0)
    {
        return [NSString stringWithFormat:@"%d年",year];
    }
    else if(month > 0)
    {
        return [NSString stringWithFormat:@"%d月",month];
    }
    else if(day > 0)
    {
        return [NSString stringWithFormat:@"%d天",day];
    }
    else if(hour > 0)
    {
        return [NSString stringWithFormat:@"%d小时",hour];
        
    }
    else if(minute > 0)
    {
        return [NSString stringWithFormat:@"%d分",minute];
    }
    else if(second > 0)
    {
        return [NSString stringWithFormat:@"%d秒",second];
    }
    else
        return @"0秒";
}


//返回一周的第几天(周末为第一天)
- (NSUInteger)weekday
{
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *weekdayComponents = [calendar components:(NSWeekdayCalendarUnit) fromDate:self];
    
    return [weekdayComponents weekday];
    
}

//将NSString转为NSDate类型的,格式未2012-12-14 12：32：23
+ (NSDate *)dateFromString:(NSString *)string
{
    return [NSDate dateFromString:string withFormat:[NSDate dbFormatString]];
}

//string转成日期
+ (NSDate *)dateFromString:(NSString *)string withFormat:(NSString *)format {
    
    NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
    
    [inputFormatter setDateFormat:format];
    
    NSDate *date = [inputFormatter dateFromString:string];
        
    return date;
}

+ (NSString *)stringFromDate:(NSDate *)date withFormat:(NSString *)format
{
    return [date stringWithFormat:format];
}

//将NSDate转为NSString类型的,格式未2012-12-14 12：32：23
+ (NSString *)stringFromDate:(NSDate *)date
{
    return [date string];
}

//NSDate 转成2012-12-30
+ (NSString *)dateFormatStringFromDate:(NSDate *)date
{
    return [self stringFromDate:date withFormat:[NSDate dateFormatString]];
}

//NSDate 转成20:20:11
+ (NSString *)timeFormatStringFromDate:(NSDate *)date
{
    return [self stringFromDate:date withFormat:[NSDate timeFormatString]];
}

+ (NSString *)stringForDisplayFromDate:(NSDate *)date prefixed:(BOOL)prefixed
{    
    /*
     
     * if the date is in today, display 12-hour time with meridian,
     
     * if it is within the last 7 days, display weekday name (Friday)
     
     * if within the calendar year, display as Jan 23
     
     * else display as Nov 11, 2008
     
     */

    NSDate *today = [NSDate date];
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *offsetComponents = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
                                          
                                                     fromDate:today];
    
    
    
    NSDate *midnight = [calendar dateFromComponents:offsetComponents];
    
    
    
    NSDateFormatter *displayFormatter = [[NSDateFormatter alloc] init];
    
    NSString *displayString = nil;
        
    // comparing against midnight
    
    if ([date compare:midnight] == NSOrderedDescending) {
        
        if (prefixed) {
            
            [displayFormatter setDateFormat:@"'at' h:mm a"]; // at 11:30 am
            
        } else {
            
            [displayFormatter setDateFormat:@"h:mm a"]; // 11:30 am
            
        }
        
    } else {
        
        // check if date is within last 7 days
        
        NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
        
        [componentsToSubtract setDay:-7];
        
        NSDate *lastweek = [calendar dateByAddingComponents:componentsToSubtract toDate:today options:0];
        
        if ([date compare:lastweek] == NSOrderedDescending) {
            
            [displayFormatter setDateFormat:@"EEEE"]; // Tuesday
            
        } else {
            
            // check if same calendar year
            
            NSInteger thisYear = [offsetComponents year];
            
            
            
            NSDateComponents *dateComponents = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
                                                
                                                           fromDate:date];
            
            NSInteger thatYear = [dateComponents year];
            
            if (thatYear >= thisYear) {
                
                [displayFormatter setDateFormat:@"MMM d"];
                
            } else {
                
                [displayFormatter setDateFormat:@"MMM d, yyyy"];
                
            }
            
        }
        
        if (prefixed) {
            
            NSString *dateFormat = [displayFormatter dateFormat];
            
            NSString *prefix = @"'on' ";
            
            [displayFormatter setDateFormat:[prefix stringByAppendingString:dateFormat]];
            
        }
        
    }
    // use display formatter to return formatted date string
    
    displayString = [displayFormatter stringFromDate:date];
        
    return displayString;
    
}

+ (NSString *)stringForDisplayFromDate:(NSDate *)date {
    
    return [self stringForDisplayFromDate:date prefixed:NO];
    
}

- (NSString *)stringWithFormat:(NSString *)format
{
    
    NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
    
    [outputFormatter setDateFormat:format];
    
    NSString *timestamp_str = [outputFormatter stringFromDate:self];
        
    return timestamp_str;
}


- (NSString *)string
{
    return [self stringWithFormat:[NSDate dbFormatString]];
}

- (NSString *)stringWithDateStyle:(NSDateFormatterStyle)dateStyle timeStyle:(NSDateFormatterStyle)timeStyle {
    
    NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
    
    [outputFormatter setDateStyle:dateStyle];
    
    [outputFormatter setTimeStyle:timeStyle];
    
    NSString *outputString = [outputFormatter stringFromDate:self];
    
    return outputString;
    
}

//返回周日的的开始时间
- (NSDate *)beginningOfWeek
{
    // largely borrowed from "Date and Time Programming Guide for Cocoa"
    
    // we'll use the default calendar and hope for the best
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDate *beginningOfWeek = nil;
    
    BOOL ok = [calendar rangeOfUnit:NSWeekCalendarUnit startDate:&beginningOfWeek
               
                           interval:NULL forDate:self];
    
    if (ok) {
        
        return beginningOfWeek;
        
    }
    // couldn't calc via range, so try to grab Sunday, assuming gregorian style
    
    // Get the weekday component of the current date
    
    NSDateComponents *weekdayComponents = [calendar components:NSWeekdayCalendarUnit fromDate:self];
    
    /*
     
     Create a date components to represent the number of days to subtract from the current date.
     
     The weekday value for Sunday in the Gregorian calendar is 1, so subtract 1 from the number of days to subtract from the date in question.  (If today's Sunday, subtract 0 days.)
     
     */
    
    NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
    
    [componentsToSubtract setDay: 0 - ([weekdayComponents weekday] - 1)];
    
    beginningOfWeek = nil;
    
    beginningOfWeek = [calendar dateByAddingComponents:componentsToSubtract toDate:self options:0];
    
    //normalize to midnight, extract the year, month, and day components and create a new date from those components.
    
    NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
                                    
                                               fromDate:beginningOfWeek];
    
    return [calendar dateFromComponents:components];
    
}

//返回当前天的年月日.
- (NSDate *)beginningOfDay
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    // Get the weekday component of the current date
    
    NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) 
                                    
                                               fromDate:self];
    
    return [calendar dateFromComponents:components];
}

//返回该月的第一天
- (NSDate *)beginningOfMonth
{    
    return [self dateAfterDay:-[self getDay] + 1];
}

//该月的最后一天
- (NSDate *)endOfMonth
{
    return [[[self beginningOfMonth] dateafterMonth:1] dateAfterDay:-1];
}

//返回当前周的周末
- (NSDate *)endOfWeek
{    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    // Get the weekday component of the current date
    
    NSDateComponents *weekdayComponents = [calendar components:NSWeekdayCalendarUnit fromDate:self];
    
    NSDateComponents *componentsToAdd = [[NSDateComponents alloc] init];
    
    // to get the end of week for a particular date, add (7 - weekday) days
    
    [componentsToAdd setDay:(7 - [weekdayComponents weekday])];
    
    NSDate *endOfWeek = [calendar dateByAddingComponents:componentsToAdd toDate:self options:0];
    
    return endOfWeek;
    
}

+ (NSString *)dateFormatString
{    
    return @"yyyy年MM月dd日";
}

+ (NSString *)timeFormatString
{    
    return @"HH:mm:ss";
}

+ (NSString *)timestampFormatString
{
    
    return @"yyyy-MM-dd HH:mm:ss";
}


+ (NSString *)dbFormatString
{
    return [NSDate timestampFormatString];
    
}

//根据日期获取星座
-(NSString *)getAstroWithMonth:(int)m day:(int)d
{
    NSString *astroString = @"魔羯水瓶双鱼白羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯";
    NSString *astroFormat = @"102123444543";
    NSString *result;
    if (m<1||m>12||d<1||d>31){
        return @"错误日期格式!";
    }
    if(m==2 && d>29)
    {
        return @"错误日期格式!!";
    }
    else if(m==4 || m==6 || m==9 || m==11)
    {
        if (d>30)
        {
            return @"错误日期格式!!!";
        }
    }
    
    result=[NSString stringWithFormat:@"%@",[astroString substringWithRange:NSMakeRange(m*2-(d < [[astroFormat substringWithRange:NSMakeRange((m-1), 1)] intValue] - (-19))*2,2)]];
    
    return result;
}

@end